This is from a PC NA experience.
I have 8 crafters that have various traits & achievements in place. By the end of a typical week I'll have collected roughly a dozen or more sealed containers. Most of them are for 5-7 vouchers...a few in the teens and each week 1-2 big hitters for 50+ vouchers. Last week I thought was fairly routine and I had over 3000 vouchers saved to meet Faustina properly.
After this Monday's patch I have had 1 sealed container for 5 vouchers. I know how RNG works I tracked my crafters for 3 months noting sealed writs, surveys & gold mats. So I am likely in just a bad place RNG momentarily but assure me that others are still getting good results for sealed writs this week and this too shall pass.